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首页> 外文期刊>Advanced Functional Materials >PdTe_2 Transition-Metal Dichalcogenide: Chemical Reactivity, Thermal Stability, and Device Implementation
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PdTe_2 Transition-Metal Dichalcogenide: Chemical Reactivity, Thermal Stability, and Device Implementation

机译：PDTE_2过渡金属二甲基化物：化学反应性，热稳定性和装置的实施

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摘要

Palladium ditelluride (PdTe2) is a novel transition-metal dichalcogenide exhibiting type-II Dirac fermions and topological superconductivity. To assess its potential in technology, its chemical and thermal stability is investigated by means of surface-science techniques, complemented by density functional theory, with successive implementation in electronics, specifically in a millimeter-wave receiver. While water adsorption is energetically unfavorable at room temperature, due to a differential Gibbs free energy of approximate to+12 kJ mol(-1), the presence of Te vacancies makes PdTe2 surfaces unstable toward surface oxidation with the emergence of a TeO2 skin, whose thickness remains sub-nanometric even after one year in air. Correspondingly, the measured photocurrent of PdTe2-based optoelectronic devices shows negligible changes (below 4%) in a timescale of one month, thus excluding the need of encapsulation in the nanofabrication process. Remarkably, the responsivity of a PdTe2-based millimeter-wave receiver is 13 and 21 times higher than similar devices based on black phosphorus and graphene in the same operational conditions, respectively. It is also discovered that pristine PdTe2 is thermally stable in a temperature range extending even above 500 K, thus paving the way toward PdTe2-based high-temperature electronics. Finally, it is shown that the TeO2 skin, formed upon air exposure, can be removed by thermal reduction via heating in vacuum.
机译：钯DitellURIDE（PDTE2）是一种新型过渡金属二巯基甲基，其表现出II型DIRAC铁饼和拓扑超导性。为了评估其技术的潜力，通过表面科学技术研究其化学和热稳定性，通过密度泛函理论互补，在电子器件中连续实现，具体地在毫米波接收器中。虽然水吸附在室温下能够充满活力地不利，但由于差分吉布斯的近似+ 12kJ摩尔（-1），Te空缺的存在使PDTE2朝向表面氧化不稳定，其出现TEO2皮肤，其即使在空气中一年后，厚度也仍保持亚纳米率。相应地，PDTE2的光电器件的测量光电流显示出一个月的时间质量的可忽略的变化（低于4％），从而排除纳米制作过程中的封装的需要。值得注意的是，基于PDTE2的毫米波接收器的响应度分别比相同操作条件中的黑色磷和石墨烯高于相似装置的13和21倍。还发现原始PDTE2在甚至高于500k的温度范围内是热稳定的，从而朝PDTE2的高温电子铺平。最后，显示在空气暴露时形成的TEO2皮肤，可以通过真空加热除去热量。

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  • 来源
    《Advanced Functional Materials》 |2020年第5期|1906556.1-1906556.12|共12页
  • 作者

    DOlimpio Gianluca; Guo Cheng; Kuo Chia-Nung; Edla Raju; Lue Chin Shan; Ottaviano Luca; Torelli Piero; Wang Lin; Boukhvalov Danil W.; Politano Antonio;

  • 作者单位

    Univ Aquila Dept Phys & Chem Sci Via Vetoio I-67100 Laquila AQ Italy;

    Chinese Acad Sci State Key Lab Infrared Phys Shanghai Inst Tech Phys 500 Yutian Rd Shanghai 200083 Peoples R China;

    Natl Cheng Kung Univ Dept Phys 1 Ta Hsueh Rd Tainan 70101 Taiwan;

    CNR IOM Lab TASC Area Sci Pk SS 14 Km 163-5 I-34149 Trieste Italy;

    Natl Cheng Kung Univ Dept Phys 1 Ta Hsueh Rd Tainan 70101 Taiwan;

    Univ Aquila Dept Phys & Chem Sci Via Vetoio I-67100 Laquila AQ Italy;

    CNR IOM Lab TASC Area Sci Pk SS 14 Km 163-5 I-34149 Trieste Italy;

    Chinese Acad Sci State Key Lab Infrared Phys Shanghai Inst Tech Phys 500 Yutian Rd Shanghai 200083 Peoples R China;

    Nanjing Forestry Univ Coll Sci Inst Mat Phys & Chem Nanjing 210037 Jiangsu Peoples R China|Ural Fed Univ Theoret Phys & Appl Math Dept Mira St 19 Ekaterinburg 620002 Russia;

    Univ Aquila Dept Phys & Chem Sci Via Vetoio I-67100 Laquila AQ Italy|CNR IMM 8 Str 5 I-95121 Catania Italy;

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  • 正文语种 eng
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  • 关键词

    DFT calculations; palladium ditelluride; surface science; transition-metal dichalcogenides; XPS;

    机译：DFT计算;钯Ditellide;表面科学;过渡 - 金属二甲硅藻剂;XPS;

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